STRreplace.java

/*
GNU General Public License
CacheWolf is a software for PocketPC, Win and Linux that
enables paperless caching.
It supports the sites geocaching.com and opencaching.de

Copyright (C) 2006  CacheWolf development team
See http://www.cachewolf.de/ for more information.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
package CacheWolf.utils;

public class STRreplace {
    /* Replace all instances of a String in a String.
     *   @param  s  String to alter.
     *   @param  f  String to look for.
     *   @param  r  String to replace it with, or null to just remove it.
     */
    public static String replace(String s, String f, String r) {
	if (s == null || s.equals(""))
	    return s;
	if (f == null || f.equals(""))
	    return s;
	if (r == null)
	    r = "";

	int index01 = s.indexOf(f);
	int index02 = 0;
	StringBuffer sb = new StringBuffer();
	while (index01 != -1) {
	    sb.append(s.substring(index02, index01)).append(r);
	    index02 = index01 + f.length();
	    index01 = s.indexOf(f, index02);
	    /* original impl.
	    s = s.substring(0,index01) + r + s.substring(index01+f.length());
	    index01 += r.length();
	    index01 = s.indexOf( f, index01 );
	    */
	}
	return sb.append(s.substring(index02)).toString();
    }
}